The referrer https://www.googleapis.com/youtube/v3/playlistItems?part=id,snippet,contentDetails,status&maxResults=9&playlistId=PLjiygVI-oDWy3yaGys83Ioi_OVJUdbu71&key=AIzaSyCN0kmGT4OT838XyWJFCd4dcs03b1EjRAU does not match the referrer restrictions configured on your API key. Please use the API Console to update your key restrictions.